« on: 22/06/2021 18:37:21 »
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Even the best solar panel reflects some of the incoming radiation. The curved office building at 20 Fenchurch Street has caused serious problemsThose aren't solar panels, it's just window glass, mounted almost vertically along a curve. In the UK, and similar latitudes, solar panels are nearly always angled at less than 40 degrees to the ground, which reflects the sun back into the sky, nor is there any reason to architecturally arrange them to cause focusing.
No, because roughly half of the ICE vehicle carbon emissions today is the fuel they burn and more if they were magically recycled with no further emissions, so that's not happening, and don't forget that electric cars are highly recyclable too. As the current fleet of fossil cars wear out and the manufacturers pull their fingers out, they're going to be replaced more and more with electric cars. That's already happening in fact more than you seem to understand, with plug-in hybrids; they're electric cars too.And what about the carbon dioxide needed to make the diesel car? That's zero is it???Yes, because we already have 30,000,000 perfectly good ICE cars and enough recyclable scrap to keep them running for another 20 years with negligible additional carbon emission, particularly if the recycling processes are mainly electrical.
Sadly, in the short term, the answer is yes.The studies say no.
According to the manufacturers, making an electric car from scratch releases around 26 - 30 tonnes of carbon dioxide, as much as a diesel car would emit in 100,000 miles.And what about the carbon dioxide needed to make the diesel car? That's zero is it??? Of course not, it's pretty similar, and then there's the diesel emissions on top.
So replacing internal combustion vehicles before they are worn out will increase global CO2 levels.The CO2 emissions during manufacturing are not an automatic given. Electric car manufacturers are already using electrical power more in production, and so their CO2 emissions are dropping as the electrical power systems become greener.
Manufacturing and siting land-based wind generators emits about 600 tonnes of CO2 per delivered megawatt. Offshore wind is slightly more efficient in terms of mean delivered power per unit installed capacity, but they require rather more concrete and steel to build - say 1000 tonnes of CO2 per MW.The generators repay these CO2 debts in a few months.
If we replace all the cars in the UK with electric cars we will need to install another 30 GW of delivered power, and if that all comes from wind at an average of 20% of installed capacity, that means 150,000,000 tonnes of CO2 must be released before we reach "zero carbon" car travel.Displacing multiple times that in avoided fossil fuel usage.
Buses, diesel trains and trucks in total account for about the same amount of energy as cars in the UK, so to replace all modes of transport with electric traction you can double the above figures.Again, displacing far dirtier modes of transportation.
Long term, of course, you will be running on a replacement basis, so carbon dioxide emissions will drop to about one tenth to one twentieth of the peak. The key question, then, is when are you prepared to release all the CO2 necessary to make the change? All at once and hope the climate scientists are wrong, or over say 20 - 50 years as the oil runs out anyway?Oil's not going to run out, unconventional sources are massive, easily enough to completely destroy the climate.
In the interim, before all the new windmills come on stream, you have to make up the balance with gas-generated electricity, as at present, except you will need to double the number of power stations and burn a lot of fossil fuel to do so. And then scrap them.No, because you can install renewable energy and build new electric vehicles AT THE SAME TIME. They're complementary.
Younger people have a more robust immune system - and more likely to get an immune over-reactionI think it was more that younger people were less at risk from covid in the first place. I don't think there's any strong evidence young people get the reaction more or less often.
Hello....I require the Quantum Jump explanation for the generation of a light wave.....If the electron can exist simultaneously in both energy levels (quantum mechanically) and would only fall in one direction, then how can a sine wave be produced? Classically, it has to radiate as an antenna to produce a sine wave, indicating classically at least, that the electron must spiral around the nucleus of the atom as it descends to radiate an electric field sine wave...Thx for the patience.....Why, that's just your basic Quantum Electrodynamics!
The UK doesn't use single turbine cycles for gas generators, it uses CCGT, the output from the gas turbines goes through a steam engine, running on the waste heat. They can achieve about 55% efficiency which makes them cheap to run while being less polluting as well. That together with nuclear and the ever growing amount of renewable generation means that the electricity is much more efficiently generated and electric cars make enormous sense in the UK.And would you like to discuss the piss poor efficiency of the engine?As I said, Sadi Carnot put that one to bed 200 years ago. But those unacquainted with thermodynamics might just refer to Wikipedia :QuoteModern passenger car diesel engines may have an effective efficiency of up to 43%, whilst engines in large diesel trucks, and buses can achieve peak efficiencies around 45%.QuoteThe energy efficiency of a conventional thermal power station is defined as saleable energy produced as a percent of the heating value of the fuel consumed. A simple cycle gas turbine achieves energy conversion efficiencies from 20 to 35%.
A bit sad, really, because I'd love to have an electric car, but for the foreseeable future it seems that it's going to burn more fossil fuel than the old diesel I already have, and I care about the planet. But that's the subject of another thread.
Just because your gas cooker is rated at 15 kW doesn't mean you have to use it all.Ironically, this only furthers my point, you simply can't. Gas cookers are only about 40% efficient, whereas electric cookers are more like 70%. Gas cookers, are great, if you want a space heater. That produces poisonous fumes. That have to be ventilated. So much win there. That hot air you just made, mostly goes straight out again. And it's mostly hot air. With poisonous carbon monoxide, nitrous oxide and sub PM2.5 particles. Mostly not hot pans.
An 8 kW heat exchanger isn't much more expensive to make and install than a 5 kW one, will do the job better and quicker on a frosty morning, and will actually work in places like North America and Central Europe in winter, so why design one specially for gentlemen motorists with heated garages in Henley?Electric cars can have 8 kW defrosters too. They're not going to be on for long. Actually, electric cars tend not to need it because you can tell them to defrost themselves at a set time when you plan to drive. So the car is lovely and warm when you get in.
I don't think anyone here doubts the validity of the Carnot cycle. But some of us appreciate that it applies equally to power stations, which is why we don't like being lied to by or electricity supplier. And of course with an ambient of -40 degrees the engine would be rather more efficient anyway.Still no. An electric car is still more efficient even at -40℉. And the electric motors themselves are more efficient at low temperatures anyway.
No, about half of the "wasted" energy you speak of, is actually used as heat. Even that dreadful internal combustion engine in a car produces around 5 - 8 kW of cabin heat, which is why electric cars don't go as far in the winter.Pretty sure no normal car gives you 8 kW of cabin heat; and that's a shedload of wasted heat, particularly in summer.
No argument there. It's much the same end-to-end efficiency as burning fossil gas to make electricity, which is what EoN seems to be actually doing under the guise of "renewable".They're not, that would be fraud.